Seduced by Shadows (Marked Souls, Book 1)

After an accident left her near death, Sera Littlejohn is struggling to piece together her life. But when a violet-eyed stranger reveals a supernatural battle veiled in the shadows, Sera is tempted to the edge of madness by a dangerous desire. Ferris Archer takes Sera under his wing now that she is talyan, possessed by a repentant demon with hellish powers.

Long Synopsis:

After an accident left her near death, Sera Littlejohn is struggling to piece together her life. But when a violet-eyed stranger reveals a supernatural battle veiled in the shadows, Sera is tempted to the edge of madness by a dangerous desire.
Ferris Archer takes Sera under his wing now that she is talyan, possessed by a repentant demon with hellish powers.
Archer and his league of warriors have long risked their demon-shattered souls to stop darker spirits from wreaking havoc, but they've never fought beside a female talya before--and never in all his centuries has Archer found a woman who captivates him like Sera.
With the balance shifting between good and evil, passion and possession, Sera and Archer must defy the darkness and dare to embrace a love that will mark them forever.